Improvement in rests for truing-off emery-wheels



E. THOMAS.

'Rests fpr Trueing off Emery-Wheels, &c.

No. |6l,7l7 Pa:entedApri|6,1s75.

IIIIIHH mmm lIIHIH WITNESSES.

PATENT FFICE-l.

ELEAZER THOMAS, OF PAWTUCKET, RHODE ISLAND.

IMPROVEMENT IN RESTS FOR TRUING-OFF EMERY-WHEELS.

Specification forming part of Letters Patent No. 161,717, dated April 6,1875; application filed March 4, 1875.

To all whom -it may concern:

Be it known that I, ELEAZER THOMAS, of Pawtucket, in the county ofProvidence and State of Ithode Island, have invented a certain ImprovedDevice, of which the following is a specification Said invention relatesto a means or device for facilitating the operation ot' truing-off solidemery-wheels, stones, grindstones, and other circular or sphericalbodies or substances, and which is also designed to be used in grindingand evening-up castings, and for other purposes.

The accompanying drawing is hereby made a part of this speciiication,similar letters of reference indicating corresponding parts.

Figure l is a top view of said device, with a part of an emery-wheel orstone shown in front thereof. Fig. 2 is a side View of Fig. l, and Fig.3 is a front view ot' said device.

The device consists of a slotted arm, a, extended froln the support I),on which is fastened an adjustable attachment comprising` the handle c,cam d, the raised sides and front e, which said raised sides affordbearings for the pivot f. The bolt and thumb-screw g h rmly secure thispart of the device to the slotted arm a. At t' is shown a part of anemery-wheel, stone, 85e., the relative position of the device to whichis apparent from said Figs. l and 2. At k is a perpendicular armextending downward from said support b, of which there may be one ortwo, as may be desired, and which tits into a cylindrical uprightattached to the frame-work in front of the wheel or stone c. Athumb-screw in said cylindrical upright is used to fasten the arm ktherein, in adjusting the entire device to the proper position relativeto said stone or wheel. By having two of said arms 7c, as shown in Figs.l and 3, the device may be used righthanded or left-handed, as might bedesired, by placing one or the other of said arms in said cylindricalupright.

The manner of using said device is substantially as follows: When usedfor grinding or evening-up castings, 85o., one end of the casting isrested on the top of the support b, and the other end is rested on thetop of the raised front e, and immediately against the cam d. Theoperator grasps the handle c with one hand, and with the other guidesthe casting aforesaid. As one end of said casting has a continualbearing against the cam d, the raising and lowering of said handle willeasily and accurately govern and control the bearing of said castingagainst the revolving wheel If the device be used in truing-otl theWheel, stone, &c., the tool to be use-d is placed and operated insubstantially the saine manner as the casting above described. rIhecomplete control over, and the accurate government of, the toolaforesaid which is given to the operator by said device, enables him toreduce the superticial inequalities of the stone or wheel with greatrapidity, steadiness, and perfect-ion. By means of the slot in the arm athe said adjustable attachment can, on loosening the thumb-screw H, becarried nearer to or removed farther from the wheel or stone, as may berequired for different-sized castings, or as may be demanded by thevarying uses and purposes to which the device may be applied.

I claim as my invention and desire to secure by Letters Patent- In arest for truing-ott' Aemcry-wheels and stones, and for evening-upcastings, 85e., the slotted har a, having a support and arm or arms, 7c,in combination with the cam-lever c d, and its supporting and adjustingdevices c g h, substantially as herein specified.

ELEAZER THOMAS.

Witnesses: I

THos. P. BARNEFIELD, GEO. WALTER BARNEFIELD.

